Add underwater missons + sky missons

[Taubsi]

This is what IA (The Developer) said on this matter:

About planetary missions and how we could possibly go about generating them

At the very early stages of development I considered if/how planetary missions could be added to CIU. I ultimately decided that it was way too much effort, because those missions work on a completely different framework on CI5. I did, however, think about how you would randomly generate such missions and I came up with something roughly equivalent to Planetary missions generator . The main issue was few (none?) of the existing enemy formations could be used, because they don’t take account “ter…